Superior corrosion-resistant 3D porous magnetic graphene foam-ferrite nanocomposite with tunable electromagnetic wave absorption properties

Microstructure induced dielectric loss in lightweight Fe3O4 foam for electromagnetic wave absorption

“…The crystal structure in Figure 2 B well exhibits the typical Fd3m space group of Fe 3 O 4 , in which Fe 3+ mostly on octahedral sites (green) and Fe 2+ mostly on tetrahedral sites (orange). The Raman spectra further confirm the crystal type of products ( Figure 2 C), in which the peaks at 219, 284 and 397 cm −1 are assigned to E 2g , T 2g and A 1g model of cubic spinel Fe 3 O 4 ( Xu et al., 2019 ). Noteworthily, a distinct redshift occurs in the peaks of S0.7 and S0.9 in comparison with the other samples, meaning the increase of residual stress and lattice distortion ( Chang et al., 2021a ).…”

Preparation and electromagnetic properties characterization of reduced graphene oxide/strontium hexaferrite nanocomposites

“…It can be seen from Figure 5a that nanocomposites are higher. The addition of a small amount of GO can greatly improve the dielectric loss capacity of the composite material, which is not only related to the conductive ability of RGO, but also related to the polarization process and electrical conductivity between the composite materials [31]. It can be clearly seen from Figure 5b The effect of magnetic loss on electromagnetic wave absorption is very important.…”

Pb(Ⅱ) adsorption characteristics of magnetic GO-hydroxyapatite and the contribution of GO to enhance its acid resistance

“…Moreover, Ca2p (Figure 2d, 347.6 eV, 351.2 eV) and P2p (Figure 2e, 133.1 eV, 133.8 eV) peaks (López et al, 2019;Lovón-Quintana et al, 2017) verified the presence of HAP in PMGO. Figure 2f shows the scan spectra of Fe2p (724.8 eV, 718.7 eV, 712.4 eV, 710.7 eV), indicating the presence of Fe3O4 in PMGO (Xu et al, 2019). Fe3O4 at 580 cm -1 (Cui et al, 2015).…”